#include "include/bt3.h"

bt3::bt3(void)
{
}

bt3::~bt3(void)
{
}

void bt3::destroyScene(void)
{
    OGRE_DELETE mTerrainGroup;
    OGRE_DELETE mTerrainGlobals;
}

void getTerrainImage(bool flipX, bool flipY, Ogre::Image& img)
{
    img.load("terrain.png", Ogre::ResourceGroupManager::DEFAULT_RESOURCE_GROUP_NAME);
    if (flipX)
        img.flipAroundY();
    if (flipY)
        img.flipAroundX();
}

void bt3::defineTerrain(long x, long y)
{
    Ogre::String filename = mTerrainGroup->generateFilename(x, y);
    if (Ogre::ResourceGroupManager::getSingleton().resourceExists(mTerrainGroup->getResourceGroup(), filename))
    {
        mTerrainGroup->defineTerrain(x, y);
    }
    else
    {
        Ogre::Image img;
        getTerrainImage( x % 2 != 0, y % 2 != 0, img);
        mTerrainGroup->defineTerrain(x, y, &img);
        mTerrainsImported = true;
    }

}

void bt3::initBlendMaps(Ogre::Terrain* terrain)
{
    Ogre::TerrainLayerBlendMap* blendMap0 = terrain->getLayerBlendMap(1);
    Ogre::TerrainLayerBlendMap* blendMap1 = terrain->getLayerBlendMap(2);
    Ogre::Real minHeight0 = 70;
    Ogre::Real fadeDist0 = 40;
    Ogre::Real minHeight1 = 70;
    Ogre::Real fadeDist1 = 15;
    float* pBlend0 = blendMap0->getBlendPointer();
    float* pBlend1 = blendMap1->getBlendPointer();
    for (Ogre::uint16 y = 0; y < terrain->getLayerBlendMapSize(); ++y)
        {
            for (Ogre::uint16 x = 0; x < terrain->getLayerBlendMapSize(); ++x)
                {
                    Ogre::Real tx, ty;
                    blendMap0->convertImageToTerrainSpace(x, y, &tx, &ty);
                    Ogre::Real height = terrain->getHeightAtTerrainPosition(tx, ty);
                    Ogre::Real val = (height - minHeight0) / fadeDist0;
                    val = Ogre::Math::Clamp(val, (Ogre::Real)0, (Ogre::Real)1);
                    *pBlend0++ = val;
                    val = (height - minHeight1) / fadeDist1;
                    val = Ogre::Math::Clamp(val, (Ogre::Real)0, (Ogre::Real)1);
                    *pBlend1++ = val;
                }
        }
    blendMap0->dirty();
    blendMap1->dirty();
    blendMap0->update();
    blendMap1->update();
}

void bt3::configureTerrainDefaults(Ogre::Light* light)
{
    // Configure global
    mTerrainGlobals->setMaxPixelError(8);
    //testing composite map
    mTerrainGlobals->setCompositeMapDistance(3000);
    // Important to set there so that the terrain knows what to use for derived data
    mTerrainGlobals->setLightMapDirection(light->getDerivedDirection());
    mTerrainGlobals->setCompositeMapAmbient(mSceneMgr->getAmbientLight());
    mTerrainGlobals->setCompositeMapDiffuse(light->getDiffuseColour());
    // Configure default import settings in case we use imported image
    Ogre::Terrain::ImportData& defaultimp = mTerrainGroup->getDefaultImportSettings();
    defaultimp.terrainSize = 513;
    defaultimp.worldSize = 12000.0f;
    defaultimp.inputScale = 600; 
    defaultimp.minBatchSize = 33;
    defaultimp.maxBatchSize = 65;
    //textures
    defaultimp.layerList.resize(3);
    defaultimp.layerList[0].worldSize = 100;
    defaultimp.layerList[0].textureNames.push_back("dirt_grayrocky_diffusespecular.dds");
    defaultimp.layerList[1].worldSize = 30;
    defaultimp.layerList[1].textureNames.push_back("grass_green-01_diffusespecular.dds");
    defaultimp.layerList[1].textureNames.push_back("grass_green-01_normalheight.dds");
    defaultimp.layerList[2].worldSize = 200;
    defaultimp.layerList[2].textureNames.push_back("growth_weirdfungus-03_diffusespecular.dds");
    defaultimp.layerList[2].textureNames.push_back("growth_weirdfungus-03_normalheight.dds");
}

void bt3::createScene(void)
{
    mCamera->setPosition(Ogre::Vector3(83, 50, 16));
    mCamera->lookAt(Ogre::Vector3(1963, 50, 1660));
    mCamera->setNearClipDistance(0.1);
    mCamera->setFarClipDistance(50000);
if (mRoot->getRenderSystem()->getCapabilities()->hasCapability(Ogre::RSC_INFINITE_FAR_PLANE))
{
mCamera->setFarClipDistance(0); 
}
//setting the directional and abient light
Ogre::Vector3 lightdir(0.55, -0.3, 0.75);
    lightdir.normalise();
    
    Ogre::Light* light = mSceneMgr->createLight("tstLight");
    light->setType(Ogre::Light::LT_DIRECTIONAL);
    light->setDirection(lightdir);
    light->setDiffuseColour(Ogre::ColourValue::White);
    light->setSpecularColour(Ogre::ColourValue(0.4, 0.4, 0.4));
    mSceneMgr->setAmbientLight(Ogre::ColourValue(0.2, 0.2, 0.2));
    //Creating a set of global terrain options
    mTerrainGlobals = OGRE_NEW Ogre::TerrainGlobalOptions();
    mTerrainGroup = OGRE_NEW Ogre::TerrainGroup(mSceneMgr, Ogre::Terrain::ALIGN_X_Z, 513, 12000.00f);
    mTerrainGroup->setFilenameConvention(Ogre::String("bt3Terrain"), Ogre::String("dat"));
    mTerrainGroup->setOrigin(Ogre::Vector3::ZERO);
    configureTerrainDefaults(light);
    
    for (long x = 0; x <= 0; ++x)
        for (long y = 0; y <= 0; ++y)
            defineTerrain(x,y);

    // sync load since we want everithing in place when we start 
    mTerrainGroup->loadAllTerrains(true);
    if (mTerrainsImported)
        {
            Ogre::TerrainGroup::TerrainIterator ti = mTerrainGroup->getTerrainIterator();
            while (ti.hasMoreElements())
            {
                Ogre::Terrain* t = ti.getNext()->instance;
                initBlendMaps(t);
            }
        }
    mTerrainGroup->freeTemporaryResources();
    //set the skybox
    mSceneMgr->setSkyDome(true, "Examples/CloudySky", 5, 8);
}

bool bt3::frameRenderingQueued(const Ogre::FrameEvent& evt)
{
    bool ret = Base::frameRenderingQueued(evt);
    if (mTerrainGroup->isDerivedDataUpdateInProgress())
    {
        mTrayMgr->moveWidgetToTray( mInfoLabel, OgreBites::TL_TOP, 0);
        mInfoLabel->show();
        if (mTerrainsImported)
        {
            mInfoLabel->setCaption("Building terrain, please wait...");
        }
        else
        {
            mInfoLabel->setCaption("Updating textures, gtfo...");
        }
    }
    else
    {
        mTrayMgr->removeWidgetFromTray(mInfoLabel);
        mInfoLabel->hide();
        if (mTerrainsImported)
        {
            mTerrainGroup->saveAllTerrains(true);
            mTerrainsImported = false;
        }
    }
    
    return ret;
}

void bt3::createFrameListener(void)
{
    Base::createFrameListener();

    mInfoLabel = mTrayMgr->createLabel(OgreBites::TL_TOP, "TInfo", "", 350);
} 
